Deep sounding exhaust?

[darrsi]

I just put my Quill exhaust back on my bike, to give my ears a rest from the Moto GP can, and one thing i've really noticed is that when your carbs are properly balanced it really changes the exhaust tone.
The Quill used to have a deep but subtle raw sound to it but now it still sounds deep but rather sensible, the difference is very noticeable.
Nowhere near as burbly as the Moto GP one though, it sounds much nicer on the ears.